Chemical and spectroscopic properties of the 3-hydroxythiophene [thiophen-3(2H)-one] system
作者:Gordon A. Hunter、Hamish McNab
DOI:10.1039/c0nj00320d
日期:——
3-Hydroxythiophene 1 spontaneously dimerises to 4,5-dihydro-5-(3-hydroxythien-2-yl)thiophen-3(2H)-one 14. 3-Hydroxythiophenes 1E and 4–10E exist in solvent-dependent equilibrium with their thiophen-3(2H)-one 1K and 4–10K tautomers; the amount of hydroxy tautomer is greater than in the case of the corresponding 3-hydroxypyrroles. 3-Hydroxythiophenes are much less reactive to electrophiles than corresponding
The chemistry of vicinal tricarbonyls. A new synthesis of substituted furans
作者:Harry H. Wassereman、Gary M. Lee
DOI:10.1016/0040-4039(94)88385-8
日期:1994.12
Enolates of acyl phosphoranylidine carboxylates react with aldehydes to form secondary alcohols which undergo intramolecular addition to the central carbonyl of a vicinal tricarbonyl unit, generated in a separate step. The resulting dihydrofuranols undergo acid-catalyzed dehydration to form 3-hydroxyfuran-2-carboxylates.
Palladium-Catalyzed Carbonylative Cycloisomerization of γ-Propynyl-1,3-diketones: A Concise Route to Polysubstituted Furans
作者:Yu Li、Zhengkun Yu
DOI:10.1021/jo9020634
日期:2009.11.20
trisubstituted furan derivatives have been efficiently synthesized via palladium(II)-catalyzed intramolecular carbonylative cycloisomerization of γ-propynyl-1,3-diketones with aryl iodides and carbonmonoxide. The mechanism suggests that in situ generated acylpalladium species from the carbonylation of aryl iodide initiates the reaction followed by cyclization of the enolized isomer of a 1,3-diketone substrate
From the Feist-Bénary Reaction to Organocatalytic Domino Michael-Alkylation Reactions: Asymmetric Synthesis of 3(2 H)-Furanones
作者:Xiaowei Dou、Xiaoyu Han、Yixin Lu
DOI:10.1002/chem.201102796
日期:2012.1.2
It all adds up! A modified Feist–Bénary reaction employing a dominoMichael–alkylation sequence was designed for the enantioselective synthesis of 3(2 H)‐furanones. L‐Threonine‐derived tertiary amine/thiourea catalysts were prepared for the first time; such catalysts promoted the designed dominoMichael–alkylationreactions in a highly enantioselective manner (see scheme).